Office (OLE) / .XLSX malware analysis — malicious · 91bb76165569f6b5

MALICIOUS

Office (OLE) / .XLSX

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: 17b5c095ac2cd64c83635c5afe4f9f1f SHA-1: 23801cbaaedde8c1374dfaec353de394f422c0a1 SHA-256: 91bb76165569f6b5a50c35eef7703b149ee7d1b87838e10070dbc9f139f9e475

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The document body text and heuristics suggest a lure to enable macros, likely to download a payload from the URL http://wyhfi19vkwt03hcrle.xyz/apple.gif. The presence of an Auto_Open macro indicates an attempt to automatically execute code upon opening the document.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `c2dc2d27a90e87fdcc044c59aed45fe776e1b180d63fa23ffc4ef09a815d1305`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4016 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.